Mo. Rev. Stat. § 115.290: Registering by mail and voting absentee ballot to provide sworn affidavit, exception.

Any person registered by mail under the provisions of section 115.159 and voting by absentee ballot shall provide an affidavit subscribed and sworn to as provided in section 115.291 regardless of the cause for requesting such ballot unless the voter is exempt from such requirement under section 115.284 or section 1973ee-3, title 42, United States Code.